Domain walls as dark energy

Friedland, Alexander; Murayama, Hitoshi; Perelstein, Maxim

doi:10.1103/physrevd.67.043519

Cited by 92 publications

(87 citation statements)

References 40 publications

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“…It might also be possible to obtain mechanically isotropic behaviour on scales with magnitude ξ small compared with the Hubble radius H −1 but large compared with the mesh scale ℓ in a disordered system of the kind whose possibility is suggested by the 5-fold example described in the next paragraph. The observational detectability of the very large scale granulation on the scale of such a correlation length has recently been examined by Friedland [24], who has thereby derived limits on η that are remarkably consistent with what has been obtained from the line of reasonning described above.…”

Section: Estimation Of the Membrane Tensionmentioning

confidence: 50%

Frozen Rigging Model of the Energy Dominated Universe

Carter

2005

Int J Theor Phys

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Abstract. Composite rigging systems, involving membranes that meet on strings that meet on monopoles, arise naturally by the Kibble mechanism as topological defects in field theories involving spontaneous symmetry breaking. Such systems will tend to freeze out into static lattice type configurations with energy contribution ultimately be provided by the membranes. It has been suggested by Bucher and Spergel that on scales large compared with the relevant (interstellar separation) distance characterising the relevant mesh length, such a system may behave as a rigidity -stabilised solid, having an approximately isotropic stress energy tensor with negative pressure, as given by a polytropic index γ = w + 1 = 1/3. It has recently been shown that such a system can be rigid enough to be stable if the number of membranes meeting at a junction is even (though not if it is odd). Using as examples an approximately O(3) symmetric scalar field model that can provide an "8 color" (body centered) cubic lattice, and an approximate U(1)× U(1) model offering a disordered "5 color" lattice, it is argued that such a mechanism can account naturally for the observed dark energy dominance of the universe, without ad hoc assumptions, other than that the relevant symmetry breaking phase transition should have occurred somewhere about the Kev energy range.

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Section: Estimation Of the Membrane Tensionmentioning

confidence: 50%

Frozen Rigging Model of the Energy Dominated Universe

Carter

2005

Int J Theor Phys

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“…One possible realization of the elastic fluid dark energy models is a frustrated network of non-Abelian cosmic strings [17,18,50,51] or domain walls [20,52]. In this section we discuss some basic aspects of these scenarios and make attempts to link them with the earlier sections.…”

Section: Possible Realizations Of Elastic Dark Energy Modelsmentioning

confidence: 99%

Cosmological perturbations in elastic dark energy models

Battye

Moss

2007

Phys. Rev. D

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We discuss the general framework for a perfect continuum medium in cosmology and show that an interesting generalization of the fluids normally used is for the medium to have rigidity and, hence, be analogous to an elastic solid. Such models can provide perfect, adiabatic fluids which are stable even when the pressure is negative, if the rigidity is sufficiently large, making them natural candidates to describe the dark energy. In fact, if the medium is adiabatic and isotropic, they provide the most general description of linearized perturbations. We derive the equations of motion and wave propagation speeds in the isotropic case. We point out that anisotropic models can also be incorporated within the same formalism and that they are classified by the standard Bravais Lattices. We identify the adiabatic and isocurvature modes allowed in both the scalar and vector sectors and discuss the predictions they make for CMB and matter power spectra. We comment on the relationship between these models and other fluid-based approaches to dark energy, and discuss a possible microphysical manifestation of this class of models as a continuum description of defect-dominated scenarios.

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“…However, retention of only this U(1)-breaking term yields a potential having a discrete Z 2 symmetry. To avoid the possibility of cosmological domain walls generated when this symmetry is broken by the vev of S [18,19,20,21,22], we include the U(1)-and Z 2 -breaking linear term proportional to a 1 as well. The resulting potential is…”

Section: The Cxsm and Its Vacuum Structurementioning

confidence: 99%

Complex singlet extension of the standard model

et al. 2009

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We analyze a simple extension of the Standard Model (SM) obtained by adding a complex singlet to the scalar sector (cxSM). We show that the cxSM can contain one or two viable cold dark matter candidates and analyze the conditions on the parameters of the scalar potential that yield the observed relic density. When the cxSM potential contains a global U (1) symmetry that is both softly and spontaneously broken, it contains both a viable dark matter candidate and the ingredients necessary for a strong first order electroweak phase transition as needed for electroweak baryogenesis. We also study the implications of the model for discovery of a Higgs boson at the Large Hadron Collider.

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Domain walls as dark energy

Cited by 92 publications

References 40 publications

Frozen Rigging Model of the Energy Dominated Universe

Frozen Rigging Model of the Energy Dominated Universe

Cosmological perturbations in elastic dark energy models

Complex singlet extension of the standard model

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